Continuous Mixing - Batch Mixing - Reactors - Dryers - Pharmaceutical - Polymer Processing - Dust Agglomeration - Operating Principles
DRUVATHERM® Shovel Dryer
Lödige DRUVATHERM® Shovel Dryers are batch-process, high speed vacuum dryers. The mixing elements, adapted to the process and rotating in a cylindrical drum, jacketed for temperature control, generate a three dimensional movement of the product. The resultant frequent contact of particles with the heat transfer surface shortens the drying times to a minimum.
• Intensive mixing prevents temperature and moisture gradients in the product
• High heat transfer mean more effective drying
• Gentle thermal treatment of the product under vacuum
• Multiphase process (mixing, granulating, drying, cooling)
• Economical solvent recuperation
Mode of Operation
The high speed mixing elements force intensive contact of individual product particle with the heated wall of the machine. Choppers, installed in the side of the machine and rotating at high speed, provide additional dispersion when the product passes from the agglomeration phase to the powder phase. In this way the surface area is enlarged increasing drying efficiency. Fine particles picked up in the solvent vapours are separated out in the pneumatically cleaned filter mounted on the machine and returned to the drying bed of product.
Range of Application
* End and intermediate pharmaceutical products
* Chemicals
* Recycling
* Different types of sludge
* Moulding, friction and fibre compounds
* Dyestuffs
* Plastics (fibre polymers)
* Agrochemicals
* Chemical specialities
Optional Equipment
* Frequency control for speed variation
* Product contact parts according to requirement in mild steel, all the usual austenitic steel qualities, duplex steels, titanium or diverse nickle-based materials
* Shaft with double action, mechanical face seals (for extreme applications magnetic fluid mechanical seals have been employed.
* GMP standards
* Supply of peripheral equipment up to a complete system
* Drum volumes in sizes from 5 - 30 000 litres
* The mixing elements can be drawn out of the drum for easy cleaning, VTA construction
